I don't think XP is going to be giving out there source code or SDK for bluetooth to the headphones. I'm sure someone could reverse engineer it but that's a different question in itself.
Would be cool to have something smaller with better sound quality, sometimes I use my wired "Beats" headphones and the difference is stunning you can really hear the different tones. Most Detecting HP are not the best sounding

I have a bluetooth TX/RX unit (really small) plugged into the jack on the remote, held in place with velcro sticky pads, which allows the use of any bluetooth earbuds. Works great. Check Amazon for any quality level you want.

For that matter this setup allows me to also have the only wireless Harbor Freight 9 function detector in existence. ........

I have looked many times; the selection of true Aptx Low Latency is extremely limited; that is why I asked.

I have tried others that claim low latency but where not certified aptX Low latency and found them too slow for metal detecting. I have a pair of the Levn earbuds that are listed on the Qualcomm aptX site and they are noticeably faster. I used them with a ML Equinox.

I have tried several TXs with those earbuds that claimed to be low latency but were not. So that why I wondered what you found that was aptX LL?

Once you use true aptX low latency the difference is apparent and anything less is unsatisfactory.

That is why I asked Architex to share the links to the true aptX Low Latency setup he says he is using. Plenty of regular ones out there with unacceptable lag. Once you try the real deal you won't be happy with the lag IMO.